US Bridges

SD071 over Alabaugh Canyon

Fair

Fall River County, South Dakota · 8.1 S of Hot Springs · Structure no. 000000024257097

Built
1998
27 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
382
2024 count
Owner
State
State Highway Agency

About this bridge

SD071 over Alabaugh Canyon is a concrete continuous culvert carrying SD071 over Alabaugh Canyon in Fall River County, South Dakota. It was built in 1998, so it is 27 years old, younger than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 382 vehicles a day, roughly 6% of them trucks, projected to reach 568 by 2044. The structure is 23 ft (6.9 m) long. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSD071
CrossesAlabaugh Canyon
Location8.1 S of Hot Springs
RouteState Highway 71
Coordinates43.33746, -103.5551
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length23 ft (6.9 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic382 (2024)
Projected traffic568 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SD071 over Alabaugh Canyon built?

It was built in 1998, making it 27 years old in 2025.

What condition is SD071 over Alabaugh Canyon in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does SD071 over Alabaugh Canyon carry?

About 382 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SD071 over Alabaugh Canyon?

The structure is 23 ft (6.9 m) long with a longest span of 11 ft (3.4 m).

Who owns SD071 over Alabaugh Canyon?

It is owned by the State Highway Agency.